Mutli instance does not work when using a ReceiveTaskActivityBehavior based prototype scoped spring bean

The trigger (signal) method of ServiceTaskDelegateExpressionActivityBehavior does not setup the multi instance behavior correctly when using a delegateExpression to a prototype scoped spring bean. This causes the "loop" to terminate when triggerd/signalled.

The AbstractBpmnActivityBehavior.multiInstanceActivityBehavior reference is not assigned before the activity is triggered/signalled.

The setup;
- A service task with multi instance properties setup.
- A delegateExpression to a prototype scoped spring bean.
- The bean is a subsclass of ReceiveTaskActivityBehavior and thus requires a trigger/signal to continue.

Empieza siguiendo ServiceTaskDelegateExpressionActivityBehavior.trigger/signal y AbstractBpmnActivityBehavior.multiInstanceActivityBehavior; después, compara cómo se inicializa un delegateExpression con ámbito prototype para una subclase de ReceiveTaskActivityBehavior. Reproduce la configuración con una service task multiinstancia y un delegado de receive task señalizado; se considera terminado cuando el bucle multiinstancia continúa en lugar de terminar.

Escrito por el modelo de indexación a partir del texto del issue.